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Archer's True Name is Nikola Tesla (ニコラ・テスラ, Nikora Tesura?), a man recognized as a genius scientist, a "worthy rival" of the King of Inventors Edison, who "controlled electromagnetism" from the 19th century to 20th century. Recognized as a "prodigy without equal" and the "Modern Prometheus", he was one of the great scholars who "clarified the power of thunder and lightning", previously described in various mythologies as a "legend of god." The "man who revealed Zeus' thunder to the world", he brought about "electricity" to human civilization.

Dubbed as the "Professor Thunder and Lightning" by Mark Twain, Archer is a haughty individual recognized as a "devil of fierce and magnificent intellect." His wish upon the Holy Grail is "to complete the Nikola Tesla World System", to bring about the "advent of a new world in which interacting electric currents come and go in space itself." He is willing to spare no efforts in the restoration of human history for the sake of that wish.

He is summoned by Makiri Zolgen before the latter is killed by Mordred. He knocks out everyone present and then heads towards the surface, intending to fully activate the "Demonic Fog". As the Protagonist, Mash Kyrielight and Mordred catch up with Tesla, he has already started activating the "Demonic Fog", causing it to begin to absorb energy all around it. However, Mordred manages to use her Noble Phantasm, Clarent Blood Arthur, to temporarily destroy a part of the fog and attacks Tesla. However, the fog soon reforms, allowing Tesla to escape.

As he arrives to the surface, he creates a stairway to the sky, but he encounters Kintoki and Tamamo-no-Mae, who fight him. Tesla though manages to escape again, running up the stairway. However, the Protagonist's party manage to finally catch up to Tesla and defeat him, causing him to fade away.

Archer qualifies for the Archer-class due to having brought about what can be called the "second coming of gods of thunder and lightning", sublimated as his Noble Phantasm, System Keraunos. As it was previously a power only endowed by beings from the Age of Gods, Archer raising civilization by making it available to all is seen as a turning point in human history, granting him the high EX rank of the Pioneer of the Stars skill. Archer can use his lightning for a number of things, such as making stairs that he, and others, can walk on. [1][2]